Except as provided in §B of this regulation, an EMS provider shall provide emergency medical services in accordance with the “Maryland Medical Protocols for EMS Providers”. The following EMS providers shall provide emergency medical services in accordance with the procedures indicated in this section: An EMD shall provide emergency medical dispatch services in accordance with the curriculum and protocols approved by the EMS Board for the EMD program with which the EMD is affiliated; An emergency medical responder not utilizing an AED shall provide emergency medical services in accordance with the emergency medical responder curriculum approved by the EMS Board; and An emergency medical responder utilizing an AED shall provide emergency medical services in accordance with the emergency medical responder curriculum approved by the EMS Board and the portions of the “Maryland Medical Protocols for EMS Providers” concerning use of an AED. An EMS provider shall provide emergency medical services under the oversight of an EMS operational program except in rare instances when an EMS provider happens upon the scene of a medical emergency.